ak4671 AKM Semiconductor, Inc., ak4671 Datasheet - Page 76

• Manufacturer Part Number: ak4671
• Description: Stereo Codec With Mic/rcv/hp-amp
• Manufacturer: AKM Semiconductor, Inc.

■
The AK4671 has a digital output volume (DATT-B: 256 levels, 0.5dB step, Mute) for recording of received voice. The
volume can be set by the BVL7-0 bits. The volume is included in front of an SRC-B block. The input data of SRC-B is
changed from +12 to –115dB or MUTE. This volume has a soft transit function. The transition time between set values of
BVL7-0 bits is 256/fs2. It takes 256/fs2 (=32ms@fs2=8kHz) from 00H (+12dB) to FFH (MUTE).
■
The AK4671 has a digital output volume (DATT-C: 256 levels, 0.5dB step, Mute) for received voice. The volume can be
set by the CVL7-0 bits. The volume is included in front of SDTOB output. The input data of SRC-C is changed from +12
to –115dB or MUTE. This volume has a soft transition function. The transition time between set values of CVL7-0 bits is
256/fs2. It takes 256/fs2 (=32ms@fs2=8kHz) from 00H (+12dB) to FFH (MUTE).
■
The AK4671 has the side tone volume (5 levels, 6dB step) for B/T phone call. The volume can be set by the SVL2-0 bits.
The volume is included at mixing path from SRC-A to DATT-C. The output data of SRC-A is changed from 0 to –24dB.
MS0666-E-00
Digital Volume for Recording of Received Voice (DATT-B)
Digital Volume for Received Voice (DATT-C)
Side Tone Volume for B/T Phone Call (SVOLB)
(default)
(default)
Table 40. Side Tone Volume B Code Table (N/A: Not available)
Table 38. Digital Volume B Code Table
Table 39. Digital Volume C Code Table
SVB2-0
Others
BVL7-0
CVL7-0
0H
1H
2H
3H
4H
FDH
FDH
FEH
FEH
FFH
FFH
00H
01H
02H
18H
00H
01H
02H
18H
:
:
:
:
- 76 -
MUTE ( −∞ )
MUTE ( −∞ )
− 12dB
− 18dB
− 24dB
− 114.5dB
− 115.0dB
− 114.5dB
− 115.0dB
− 6dB
+12.0dB
+11.5dB
+11.0dB
Gain
+12.0dB
+11.5dB
+11.0dB
N/A
0dB
Gain
Gain
0dB
0dB
:
:
:
:
(default)
0.5dB
0.5dB
Step
Step
[AK4671]
2007/10